Tectonics of the terrestrial litosphere in spherical harmonics

18th International Conference PhysicA.SPb

Mokhnatkin, A.V.^1,2 ; Petrov, S.D.^2 ; Gorshkov, V.L.^1,2 ; Shcherbakova, N.V.^1,2 ; Smirnov, S.S.^1,2 ; Trofimov, D.A.^2

Main Astronomical Observatory, Russian Academy of Sciences, St.Petersburg, Russia^1

St.Petersburg State University, St.Petersburg, Russia^2

关键词: Geodetic networks;    Geodetic observation;    Lithospheric;    Poloidal components;    Spherical harmonics;    Standard theories;    Vector spherical harmonics;    Velocity field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/769/1/012007/pdf
DOI  :  10.1088/1742-6596/769/1/012007

来源: IOP

【 摘 要 】

According to the classical tectonics theory, lithosphere is divided into more than twenty plates that are considered as absolutely rigid. However, modern astronomical and geodetic observations reveal disagreements with the standard theory. First of all, there are already more than two hundreds plates and newer ones are still being discovered. Then, it was found out that lithospheric plates cannot be regarded as absolutely rigid, since they are evidently subject to deformations. This work is aimed at expansion of velocities of the global geodetic network stations into vector spherical harmonic series on the assumption of division of the velocity field into toroidal and poloidal components. Spherical harmonics up to fourth degree are obtained for corresponding components and a preliminary attempt of their geophysical interpretation is submitted.